1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * vivid-kthread-out.h - video/vbi output thread support functions.
4 *
5 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
6 */
7
8 #include <linux/module.h>
9 #include <linux/errno.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/font.h>
15 #include <linux/mutex.h>
16 #include <linux/videodev2.h>
17 #include <linux/kthread.h>
18 #include <linux/freezer.h>
19 #include <linux/random.h>
20 #include <linux/v4l2-dv-timings.h>
21 #include <asm/div64.h>
22 #include <media/videobuf2-vmalloc.h>
23 #include <media/v4l2-dv-timings.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-fh.h>
26 #include <media/v4l2-event.h>
27
28 #include "vivid-core.h"
29 #include "vivid-vid-common.h"
30 #include "vivid-vid-cap.h"
31 #include "vivid-vid-out.h"
32 #include "vivid-radio-common.h"
33 #include "vivid-radio-rx.h"
34 #include "vivid-radio-tx.h"
35 #include "vivid-sdr-cap.h"
36 #include "vivid-vbi-cap.h"
37 #include "vivid-vbi-out.h"
38 #include "vivid-osd.h"
39 #include "vivid-ctrls.h"
40 #include "vivid-kthread-out.h"
41
vivid_thread_vid_out_tick(struct vivid_dev * dev)42 static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
43 {
44 struct vivid_buffer *vid_out_buf = NULL;
45 struct vivid_buffer *vbi_out_buf = NULL;
46
47 dprintk(dev, 1, "Video Output Thread Tick\n");
48
49 /* Drop a certain percentage of buffers. */
50 if (dev->perc_dropped_buffers &&
51 prandom_u32_max(100) < dev->perc_dropped_buffers)
52 return;
53
54 spin_lock(&dev->slock);
55 /*
56 * Only dequeue buffer if there is at least one more pending.
57 * This makes video loopback possible.
58 */
59 if (!list_empty(&dev->vid_out_active) &&
60 !list_is_singular(&dev->vid_out_active)) {
61 vid_out_buf = list_entry(dev->vid_out_active.next,
62 struct vivid_buffer, list);
63 list_del(&vid_out_buf->list);
64 }
65 if (!list_empty(&dev->vbi_out_active) &&
66 (dev->field_out != V4L2_FIELD_ALTERNATE ||
67 (dev->vbi_out_seq_count & 1))) {
68 vbi_out_buf = list_entry(dev->vbi_out_active.next,
69 struct vivid_buffer, list);
70 list_del(&vbi_out_buf->list);
71 }
72 spin_unlock(&dev->slock);
73
74 if (!vid_out_buf && !vbi_out_buf)
75 return;
76
77 if (vid_out_buf) {
78 v4l2_ctrl_request_setup(vid_out_buf->vb.vb2_buf.req_obj.req,
79 &dev->ctrl_hdl_vid_out);
80 v4l2_ctrl_request_complete(vid_out_buf->vb.vb2_buf.req_obj.req,
81 &dev->ctrl_hdl_vid_out);
82 vid_out_buf->vb.sequence = dev->vid_out_seq_count;
83 if (dev->field_out == V4L2_FIELD_ALTERNATE) {
84 /*
85 * The sequence counter counts frames, not fields.
86 * So divide by two.
87 */
88 vid_out_buf->vb.sequence /= 2;
89 }
90 vid_out_buf->vb.vb2_buf.timestamp =
91 ktime_get_ns() + dev->time_wrap_offset;
92 vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
93 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
94 dprintk(dev, 2, "vid_out buffer %d done\n",
95 vid_out_buf->vb.vb2_buf.index);
96 }
97
98 if (vbi_out_buf) {
99 v4l2_ctrl_request_setup(vbi_out_buf->vb.vb2_buf.req_obj.req,
100 &dev->ctrl_hdl_vbi_out);
101 v4l2_ctrl_request_complete(vbi_out_buf->vb.vb2_buf.req_obj.req,
102 &dev->ctrl_hdl_vbi_out);
103 if (dev->stream_sliced_vbi_out)
104 vivid_sliced_vbi_out_process(dev, vbi_out_buf);
105
106 vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
107 vbi_out_buf->vb.vb2_buf.timestamp =
108 ktime_get_ns() + dev->time_wrap_offset;
109 vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
110 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
111 dprintk(dev, 2, "vbi_out buffer %d done\n",
112 vbi_out_buf->vb.vb2_buf.index);
113 }
114 dev->dqbuf_error = false;
115 }
116
vivid_thread_vid_out(void * data)117 static int vivid_thread_vid_out(void *data)
118 {
119 struct vivid_dev *dev = data;
120 u64 numerators_since_start;
121 u64 buffers_since_start;
122 u64 next_jiffies_since_start;
123 unsigned long jiffies_since_start;
124 unsigned long cur_jiffies;
125 unsigned wait_jiffies;
126 unsigned numerator;
127 unsigned denominator;
128
129 dprintk(dev, 1, "Video Output Thread Start\n");
130
131 set_freezable();
132
133 /* Resets frame counters */
134 dev->out_seq_offset = 0;
135 if (dev->seq_wrap)
136 dev->out_seq_count = 0xffffff80U;
137 dev->jiffies_vid_out = jiffies;
138 dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
139 dev->out_seq_resync = false;
140
141 for (;;) {
142 try_to_freeze();
143 if (kthread_should_stop())
144 break;
145
146 if (!mutex_trylock(&dev->mutex)) {
147 schedule_timeout_uninterruptible(1);
148 continue;
149 }
150
151 cur_jiffies = jiffies;
152 if (dev->out_seq_resync) {
153 dev->jiffies_vid_out = cur_jiffies;
154 dev->out_seq_offset = dev->out_seq_count + 1;
155 dev->out_seq_count = 0;
156 dev->out_seq_resync = false;
157 }
158 numerator = dev->timeperframe_vid_out.numerator;
159 denominator = dev->timeperframe_vid_out.denominator;
160
161 if (dev->field_out == V4L2_FIELD_ALTERNATE)
162 denominator *= 2;
163
164 /* Calculate the number of jiffies since we started streaming */
165 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
166 /* Get the number of buffers streamed since the start */
167 buffers_since_start = (u64)jiffies_since_start * denominator +
168 (HZ * numerator) / 2;
169 do_div(buffers_since_start, HZ * numerator);
170
171 /*
172 * After more than 0xf0000000 (rounded down to a multiple of
173 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
174 * jiffies have passed since we started streaming reset the
175 * counters and keep track of the sequence offset.
176 */
177 if (jiffies_since_start > JIFFIES_RESYNC) {
178 dev->jiffies_vid_out = cur_jiffies;
179 dev->out_seq_offset = buffers_since_start;
180 buffers_since_start = 0;
181 }
182 dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
183 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
184 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
185
186 vivid_thread_vid_out_tick(dev);
187 mutex_unlock(&dev->mutex);
188
189 /*
190 * Calculate the number of 'numerators' streamed since we started,
191 * not including the current buffer.
192 */
193 numerators_since_start = buffers_since_start * numerator;
194
195 /* And the number of jiffies since we started */
196 jiffies_since_start = jiffies - dev->jiffies_vid_out;
197
198 /* Increase by the 'numerator' of one buffer */
199 numerators_since_start += numerator;
200 /*
201 * Calculate when that next buffer is supposed to start
202 * in jiffies since we started streaming.
203 */
204 next_jiffies_since_start = numerators_since_start * HZ +
205 denominator / 2;
206 do_div(next_jiffies_since_start, denominator);
207 /* If it is in the past, then just schedule asap */
208 if (next_jiffies_since_start < jiffies_since_start)
209 next_jiffies_since_start = jiffies_since_start;
210
211 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
212 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
213 }
214 dprintk(dev, 1, "Video Output Thread End\n");
215 return 0;
216 }
217
vivid_grab_controls(struct vivid_dev * dev,bool grab)218 static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
219 {
220 v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
221 v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
222 v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
223 v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
224 v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
225 }
226
vivid_start_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)227 int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
228 {
229 dprintk(dev, 1, "%s\n", __func__);
230
231 if (dev->kthread_vid_out) {
232 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
233
234 if (pstreaming == &dev->vid_out_streaming)
235 dev->vid_out_seq_start = seq_count;
236 else
237 dev->vbi_out_seq_start = seq_count;
238 *pstreaming = true;
239 return 0;
240 }
241
242 /* Resets frame counters */
243 dev->jiffies_vid_out = jiffies;
244 dev->vid_out_seq_start = dev->seq_wrap * 128;
245 dev->vbi_out_seq_start = dev->seq_wrap * 128;
246
247 dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
248 "%s-vid-out", dev->v4l2_dev.name);
249
250 if (IS_ERR(dev->kthread_vid_out)) {
251 int err = PTR_ERR(dev->kthread_vid_out);
252
253 dev->kthread_vid_out = NULL;
254 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
255 return err;
256 }
257 *pstreaming = true;
258 vivid_grab_controls(dev, true);
259
260 dprintk(dev, 1, "returning from %s\n", __func__);
261 return 0;
262 }
263
vivid_stop_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)264 void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
265 {
266 dprintk(dev, 1, "%s\n", __func__);
267
268 if (dev->kthread_vid_out == NULL)
269 return;
270
271 *pstreaming = false;
272 if (pstreaming == &dev->vid_out_streaming) {
273 /* Release all active buffers */
274 while (!list_empty(&dev->vid_out_active)) {
275 struct vivid_buffer *buf;
276
277 buf = list_entry(dev->vid_out_active.next,
278 struct vivid_buffer, list);
279 list_del(&buf->list);
280 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
281 &dev->ctrl_hdl_vid_out);
282 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
283 dprintk(dev, 2, "vid_out buffer %d done\n",
284 buf->vb.vb2_buf.index);
285 }
286 }
287
288 if (pstreaming == &dev->vbi_out_streaming) {
289 while (!list_empty(&dev->vbi_out_active)) {
290 struct vivid_buffer *buf;
291
292 buf = list_entry(dev->vbi_out_active.next,
293 struct vivid_buffer, list);
294 list_del(&buf->list);
295 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
296 &dev->ctrl_hdl_vbi_out);
297 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
298 dprintk(dev, 2, "vbi_out buffer %d done\n",
299 buf->vb.vb2_buf.index);
300 }
301 }
302
303 if (dev->vid_out_streaming || dev->vbi_out_streaming)
304 return;
305
306 /* shutdown control thread */
307 vivid_grab_controls(dev, false);
308 kthread_stop(dev->kthread_vid_out);
309 dev->kthread_vid_out = NULL;
310 }
311